? coilcraft, inc. 2009 rs-232 emi filter modules document 153 specifications subject to change without notice. document 153 revised 11/26/02 coilcraft?s emi filter modules are an easy, effective way to eliminate the problems of stray electromagnetic inter- ference (emi) in signal cables running between poorly filtered equipment. available in db-25, -15 and -9 versions, the modules plug between an rs-232 cable and an input or output port. common mode magnetics filter all lines including the frame ground, attenuating emi over the critical 30 - 300 mhz range while leaving data signals totally undisturbed. comparable emi filters for circuit board mounting are also available. a b c pins 1.35 2.25 0.67 dlfc9 34,29 57,15 17,02 9 1.65 2.25 0.67 dlfc15 41,91 57,15 17,02 15 2.16 2.25 0.67 DLFC25 54,86 57,15 17,02 25 30 20 10 0 -10 0.1 1 10 100 1000 frequency (mhz) attenuation (db) differential mode common mode b male db female db c a typical attenuation 1 1. measured on hp 8753d network analyzer. ref: 50 ohms. 2. operating temperature range ?40c to +85c. 3. electrical specifications at 25c.
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